Preparation method of nanometer microporous thermal insulation material

A technology for thermal insulation materials and manufacturing methods, which is applied in the field of manufacturing nano-microporous thermal insulation materials, and can solve problems such as damaging the high-temperature performance of thermal insulation materials

Active Publication Date: 2014-06-11
上海柯瑞冶金炉料有限公司 +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In order to control this phenomenon, inorganic binders such as water glass or hard calcium silicate are introduced

Method used

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  • Preparation method of nanometer microporous thermal insulation material
  • Preparation method of nanometer microporous thermal insulation material

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The design specifications of the nano-microporous insulation material products are 300mm (length) × 300mm (width) × 30mm (height). It is composed of nano-silica, infrared shading agent, refractory and ceramic fiber. Accurately weigh the above raw materials, first disperse the ceramic fibers with a high-speed mixer, then add other raw materials and the dispersed ceramic fibers in turn into the mixer, and continue stirring until the mixture is uniform. Composition bulk density 40Kg / m 3 , The average particle size of the powder is 30-50 nanometers, the diameter of the ceramic fiber is 6 microns, and the length is 5mm.

[0027] The cavity size is 309mm (length) × 309mm (width) × 186mm (height). The diameter of the small holes through the die bottom plate and the punch plate is 1mm, and they are distributed equidistantly in a 10mm square. Lay a 320-mesh screen on the bottom of the mold, load the material, and then cover the surface of the powder with a 320-mesh screen. S...

Embodiment 2

[0030] The design specifications of the nano-microporous insulation material products are 300mm (length) × 300mm (width) × 20mm (height). Its composition and raw material processing method are with embodiment 1.

[0031] The cavity size is 309mm (length) × 309mm (width) × 124mm (height). The diameter of the small holes through the die bottom plate and the punch plate is 1mm, and they are distributed equidistantly in a 12mm square. Lay a mesh of less than 320 mesh on the bottom of the mold, load the material, and then cover the surface of the powder with a mesh of 320 mesh. Start the press, the pressure is 2MPa. When it is compressed to a cavity height of 24mm, stop the punch from descending, keep the pressure for 1 minute, and then unload. Stay for a while, waiting for the green body to rebound. Then press again to the cavity height of 20mm (overpressure 3%), keep the pressure for 1 minute again, demould, the green body rebounds to a height of 20.6mm, that is, the size of ...

Embodiment 3

[0034] figure 1 It is a schematic diagram of the distribution of the exhaust holes on the bottom plate of the mold and the upper punch panel. The diameter of the exhaust holes is 0.5-1mm, and they are distributed equidistantly in a square of 8-12mm. The size and spacing of the holes can be adjusted according to the exhaust requirements. For compression For ceramic materials with a ratio of 500-800%, the above vent holes are suitable.

[0035] figure 2It is a schematic diagram of double-sided press molding. In the figure, 1. Die wall, 2. Composition powder, 3. Sand net, 4. Lower vent hole, 5. Upper vent hole, 6. Movable mold bottom plate, 7. Punch Head, 8. Punch panel, 9. Punch vent.

[0036] Using double-sided pressure and opening through holes on the bottom plate of the mold and the upper punch panel ( figure 1 shown) is suitable.

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Abstract

The invention discloses a preparation method of a nanometer microporous thermal insulation material. A component of the nanometer microporous thermal insulation material comprises nano silica, an infrared opacifying agent, a refractory body, and ceramic fiber; average particle size of the component ranges from 15 to 50nm; and bulk density ranges from 40 to 60kg/m<3>. According to the preparation method, the raw materials above are mixed uniformly, and are subjected to dry-pressing moulding; in moulding processes, through small holes arranged on the bottom of a die and the plane of a puncher pin are used for air exhaust, and a screen mesh is used for covering the through small holes so as to avoid escaping of nano powder; the puncher pin and the bottom plate of the die are moved downward and upward respectively at a same speed so as to avoid density nonuniformity caused by frictional force when powder compression ratio is too high; double-surface pressing and moderate overpressure are adopted so as to avoid bounce error and control product thickness; and sheet material obtained via dry-pressing is subjected to sintering at a temperature of 800 DEG C, and furnace cooling.

Description

technical field [0001] The invention discloses a method for manufacturing a nano-microporous thermal insulation material. Background technique [0002] High-performance thermal insulation materials are of great significance for energy saving and consumption reduction. Due to its unique microstructure, nano-microporous thermal insulation materials have excellent thermal insulation properties, and their thermal conductivity can even be lower than that of vacuum. The iron and steel industry is a high-energy-consuming industry. If high-performance thermal insulation materials are used for the lining of the blast furnace, the energy utilization rate will be effectively improved. However, in addition to ultra-low thermal conductivity, the thermal insulation material for the lining of the blast furnace should also have certain mechanical strength and long-term stability at high temperatures (800-1000°C). USP6,936,326 thermal insulation material composition includes fine metal oxi...

Claims

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Application Information

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IPC IPC(8): C04B30/02
Inventor 胡一晨吴朝齐蓝振华赵玲娣柯美亚祝惟人
Owner 上海柯瑞冶金炉料有限公司
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